CN102077306B - Method for switching without any interruption between winding taps on a tap-changing transformer - Google Patents

Method for switching without any interruption between winding taps on a tap-changing transformer Download PDF

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Publication number
CN102077306B
CN102077306B CN 200880130034 CN200880130034A CN102077306B CN 102077306 B CN102077306 B CN 102077306B CN 200880130034 CN200880130034 CN 200880130034 CN 200880130034 A CN200880130034 A CN 200880130034A CN 102077306 B CN102077306 B CN 102077306B
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China
Prior art keywords
igbt
side
ap
bp
bn
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CN 200880130034
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Chinese (zh)
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CN102077306A (en
Inventor
O·布吕克尔
D·多纳尔
H-H·莱克曼-米斯克
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赖茵豪森机械制造公司
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Priority to PCT/EP2008/007003 priority Critical patent/WO2010022751A1/en
Publication of CN102077306A publication Critical patent/CN102077306A/en
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Publication of CN102077306B publication Critical patent/CN102077306B/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current

Abstract

The invention relates to a method for switching without any interruption between two winding taps (tap n, tap n+1) of a tap-changing transformer, wherein each of the two winding taps is connected to the common load output line via in each case one mechanical switch (Ds) and a series circuit, arranged in series thereto, comprising two IGBTs (Ip, In) which are switched in opposite directions.

Description

The changing method that nothing is interrupted between the winding tap of adjustable variable-pressure device

Technical field

The present invention relates to a kind of between the winding tap of adjustable variable-pressure device (Stufentransformator) with thyristor without the method for interruptedly switching.

Background technology

A kind of like this method of using thyristor is disclosed in WO 01/22447.There described method both with electrical switchgear IGBT, also with mechanical contact work.It is designed so that actual load transfer realizes with two IGBT with the diode in the Gradetz connection when load current.The requisite item of this known method is identification and detects corresponding current over-zero conduct for the prerequisite of carrying out load transfer at this time point.

WO97/05536 discloses the another kind of method of utilizing the IGBT switching device, and wherein the tap of the adjustment coil of power transformer is connected with public load leads via the series circuit of two IGBT.This known method is according to the principle work of pulse-width modulation; Wherein, in the other method step, (transiente reactiveReaktanz:TER) realizes the restriction to loop current by the idle reactance of the transient state of tapped coil.

This method requires shunting switch to the specific matching of separately the adjustable variable-pressure device that should connect.That is to say, adjustable variable-pressure device and shunting switch are coordinated and electrically acting in conjunction mutually.Therefore that this known method is unsuitable for being applied to is independent, can be general, be not the shunting switch according to specific adjustable variable-pressure device design.

Summary of the invention

An object of the present invention is to provide a kind of method of the type that beginning mentions, its simple structure has high functionally, and does not wherein need to only have just in time switch when load current.In addition, another object of the present invention provides a kind of corresponding method, and it under any circumstance namely can be worked in the situation of regulating for the concrete adjustable variable-pressure device that should be connected not carrying out.

This task realizes by the method with claim 1 feature.Dependent claims relates to particularly advantageous extended mode of the present invention.

In addition, this task realizes by the amended a kind of method with claim 3 feature.

The method according to this invention stems from so general creative idea; be that piezo-resistance is not the parts that are used as known in the prior art for a long time for overvoltage protection; but be used for by corresponding method step the load current of shunting switch being transformed into opposite side from a side, namely be transformed into the winding tap that will newly connect from the winding tap of connecting so far.

In the method according to the invention, the piezo-resistance with each IGBT is connected in parallel of special parameter designing is carried out new function: be transformed into piezo-resistance in parallel (little conversion loop) afterwards at load current subsidiary, that driven by line voltage from the IGBT that cuts off, the piezo-resistance that load current flows through produces a voltage according to its I-U characteristic curve, and this voltage is relatively very little and in fact keep constant during the OLTC transfer process to the dependence of current instantaneous value.

Wherein, piezo-resistance by parameter designing for so that the pressure sensitive voltage that is produced when the peak value that loads with maximum current also have for the enough safe distances of the maximum cut-ff voltage of IGBT.

On the other hand, the clamp voltage of the piezo-resistance (U when 1mA Var) must be apparently higher than the peak value of maximum level voltage, so load current can be transformed on the side that receives load current (large conversion loop) via step voltage from the OLTC side of cutting off.

Difference Δ U between the instantaneous value of the voltage drop on the piezo-resistance and the instantaneous value of step voltage causes load current to be transformed into the receiver side of shunting switch via the leakage inductance of lead inductance and tapped coil, and determines di/dt (the Δ U=L of transfer process KomDi/dt).

Obviously, in the scope of the method according to this invention, piezo-resistance is not to be used for reducing transient overvoltage as known according to prior art.In the method, piezo-resistance is born and following functions that prior art do not relate to atypical for its type as the part of this method:

-receive load current from the IGBT of hard cut-out

-generate irrespectively must be between IGBT maximum cut-ff voltage and maximum level voltage peak with the load current instantaneous value voltage drop

-the voltage time face that load current is transformed into the shunting switch side that receives from the electric current of shunting switch conduction side via rightabout step voltage is provided:

∫ Var Udt = L Kom · I L ( t ) + ∫ U St dt .

Provide function listed above just to simplify and alleviated in the corresponding way the transfer process of power electronic by piezo-resistance:

-very little energy is applied among the hardwired IGBT

-the loss of energy that in transfer process, cutting off side and produce inevitably

Especially require in the situation of high (instantaneous value of load current is high, and the instantaneous value of rightabout step voltage is high, and the leakage inductance of the level of connection is large) very most of by piezo-resistance and only have small part to be absorbed by the IGBT that cuts off in conversion.

-this situation allows to realize the very simple and economic parameter designing of power electronic switching group, because amount of energy is in the situation that piezo-resistance can change neatly, and, more expensive more much smaller than the igbt chip and the capacity that only can change aspect amount much bigger very difficultly.

-as another advantageous effects of carrying out load current conduction by piezo-resistance, necessary conversion-voltage-time face being provided and absorbing equally the loss of energy that wherein produces by piezo-resistance by piezo-resistance, for the cut-out of the IGBT group of cutting off constantly and the connection very large margin of tolerance of synchronous generation constantly of the IGBT that receives group.Following switching mode is possible and allows:

-spaced

Cut off the cutting-off process of side prior to the connection process of receiver side.The current flowing time of load current on one of two piezo-resistances cutting off side correspondingly prolongs.

-simultaneously

Cutting-off process and the connection process of these two IGBT groups are carried out simultaneously.Under normal circumstances, there is not additional load current load time in piezo-resistance.

-overlapping

The connection process of the shunting switch side that receives was carried out before the cutting-off process of the side of cutting off.During overlapping time, two IGBT groups are closed, thereby step voltage begins to produce circulating current in this time interval.The di/dt of the circulating current that produces depends at the instantaneous value of copying step voltage in the time interval, and depends on the loop inductance of circulating current.Circulating current is added on the load current in the side of cutting off, and until causes and electric current (I during cutting-off process L(t)+I C(t)) gradually rising.This causes the raising at the transition loss energy of switch sides generation, and causes the prolongation of transfer process.

The method according to this invention has series of advantages with respect to prior art:

In the situation that cutting off simultaneously and connect, two IGBT groups realize minimum loss and extremely short change-over time.

If the process along with the operating time, because Point Drifting and part aging in the control electronic component and should the magnitude setting level be overlapping or spaced (lueckend) transfer characteristic of approximately ± 10 μ s, then in design in a circuit according to the invention, do not producing function thus and endangering.

Unique result is the transition loss of suitably rising and the change-over time that slightly prolongs.

In-all three switching modes of mentioning in front, ohm of piezo-resistance/ohmic energy absorption cause in the situation that the obvious decay of transfer process electric current and change in voltage curve as important positive side effect.In the situation that the vibration that the so fast generation expected in conjunction with the leakage inductance of tap winding and winding electric capacity of transfer process (the 10 μ s order of magnitude) is disturbed may be because the overdamp effect of piezo-resistance and not producing.

In addition, the voltage that produces owing to load current at the piezo-resistance place is relatively constant, and therefore produces constant di/dt in transfer process.Because this situation also makes strong oscillatory excitation be difficult to carry out.

-in the situation of very high load voltage, be suitable for arranging in known manner that current over-zero detects and carry out transfer process in the situation of the very little instantaneous value of load current during in time near current zero-crossing point.

This measure causes the current loading of IGBT and piezo-resistance and the transition loss energy significantly reduces and cause shorten change-over time.

Make it possible in the constant situation of the hardware of power electronic parts, realize that near the conversion the current over-zero the specified switch power of shunting switch significantly promotes.

Description of drawings

Below exemplarily introduce in more detail this method by means of accompanying drawing.

Accompanying drawing 1 shows the schematic flow diagram according to the first method of the present invention.

Accompanying drawing 2 shows the first circuit that is particularly suitable for carrying out this method, the piezo-resistance that has IGBT and be connected in parallel with each IGBT.

Accompanying drawing 3 shows for amended another circuit of carrying out this method.

Accompanying drawing 4 shows the schematic flow diagram according to the second method of simplification of the present invention.

Embodiment

Fig. 1 shows a kind of schematic flow diagram according to the first method of the present invention.The method relates to: the shunting switch for wherein being transformed into from the winding tap so far of adjustable variable-pressure device new winding tap, two load branch are set, and these two load branch can be via mechanical switch DS aAnd DS bWith the series connection with it setting be parallel with respectively diode d An, d Apd Bn, d BpRespectively by two opposite IGBT (I that connect An, I ApI Bn, I Bp) series circuit that consists of is electrically connected with common load leads, and with described IGBT in each arranges respectively a piezo-resistance V in parallel An, V ApV Bn, V BpEach should be by long-term work main contact MC in these two load branch aOr MC bCross-over connection.

As first step, the mechanical switch DS as releasing contact (Freischaltkontakt) of both sides aAnd DS bClosed.

Then, starting resistor is applied to the IGBT (I that cuts off side An, I Ap) grid.

Then, cut off the long-term work main contacts MC of side aDisconnect.

Again then, load current I LBe transformed on the IGBT that cuts off side.

Cut off these IGBT (I of side An, I Ap) obtain now to cut off to order the IGBT (I of the side that will connect Bn, I Bp) obtain to connect and order.

Then, cut off the IGBT (I of side AnAnd I Ap) " firmly " cut-out.

According to the present invention, load current is transformed into the piezo-resistance V that cuts off side now AnAnd V ApOn.

Then, this load current is transformed into the IGBT (I of the side that receives, will connect Bn, I Bp) on.

Again then, the long-term work main contacts MC of receiver side bBe closed.

Subsequently, the IGBT (I of receiver side BnAnd I Bp) be transformed into nonconducting state.

Last method step is to disconnect mechanical contact DS aAnd DS b, they are protected IGBT for the instantaneous voltage load that may act on the tap winding.

Accompanying drawing 2 shows a kind of circuit that is particularly suitable for realizing with reference to the accompanying drawings 1 method.Wherein, in two coil taps (tap n and tap n+1) each via mechanical switch DS aOr DS bUtilization (is I in the n side by separately two the opposite IGBT that connect AnAnd I Ap, and be I in the n+1 side BnAnd I Bp) series circuit that consists of goes between with shunting switch and be connected.With each IGBT a diode d is set in parallel An, d Apd Bn, d Bp, wherein two diodes in each load branch connect mutually on the contrary.

With each single IGBT a piezo-resistance V is set respectively also in parallel An, V ApOr V Bn, V Bp

Also show at last the respectively long-term work main contact MC of the whole switching device of bridge joint when fixing operation of each side aOr MC bIGBT (the I of two sides An, I ApI Bn, I Bp) by IGBT driver control public, that only schematically show, well known in the prior art.

Piezo-resistance V An, V ApOr V Bn, V BpBy parameter be arranged so that its pressure sensitive voltage be lower than the maximum blocking voltage of IGBT separately in parallel, but be higher than the maximum instantaneous value ground of step voltage.

Below will be by means of this circuit in more detail from tap n the method according to this invention, i.e. transfer process to be described to tap n+1 as example:

Go up in position, load current is via the long-term work main contact MC of tap n aFlow to shunting switch lead-in wire Y.

As the first step of transfer process, releasing contact DS aAnd DS bBe switched on.

Then, at IGBT:I AnAnd I ApGrid on apply starting resistor.Now, long-term work main contact MC aDisconnect, and load current I LBe transformed into IGBT group I An/ I ApOn.

At IGBT group I An/ I ApUpper I LObtain to cut off instructions and IGBT group I less than these IGBT after current flowing duration of 10ms Bn/ I BpSimultaneously (at least under normal circumstances) acquisition goes code.

Propagate on the pressure sensitive voltage in parallel at the voltage that the IGBT that cuts off produces.If reach the clamp voltage of piezo-resistance behind hundreds of ns, then piezo-resistance begins conducting, and the voltage at IGBT place is divided into two compositions:

-pressure sensitive voltage that also slightly rises

The Ldi/dt in little conversion loop between the piezo-resistance of-IGBT and parallel connection.

The lowland is couple on the IGBT because piezo-resistance is responded to very, so the conversion of maximum load current from IGBT to the piezo-resistance realizes in 0.1 to 1 μ s.

Piezo-resistance is arranged so that by parameter the voltage of the piezo-resistance that load current flows through is lower than on the one hand the maximum blocking voltage of IGBT in parallel, is higher than the maximum instantaneous value ground variation of step voltage on the other hand.

The instantaneous value that the instantaneous value of pressure sensitive voltage surpasses step voltage causes A lateral load electric current with almost constant di/dt reduction conversion (Abkommutierung) and via tapped coil L σThe leakage inductance of (changing greatly the loop) is transferred on the B side with identical di/dt (in this case on the occasion of ground) with step voltage.Although the electric current that continues to reduce flows through the piezo-resistance on the A side, pressure sensitive voltage keeps constant in first is similar to.

After about 10 μ s, the piezo-resistance that whole load current flows through from the electric current of A side is transformed into the IGBT of the conducting of B side.Along with the approaching value 0 of the electric current of A side, the voltage on the switches set A changes basically:

Pressure sensitive voltage punctures, transient state Vanishing, and polarity and the step voltage of piezo-resistance in parallel separately on the IGBT of a blocking-up appear depending at IGBT/ piezo-resistance group A.Even at the peak value that loads with step voltage, piezo-resistance does not yet allow significant current flowing.

When being transformed into the B rear flank and being less than 10ms from the A side on load current power electronic ground, long-term work main contact MC bClosure, and IGBT group B shunting.Then, IGBT:I Bn/ I BpBe switched to not conducting state via grid control.

Transfer process is with the releasing contact DS of machinery aAnd DS bDisconnect and finishing, these releasing contacts can be protected IGBT for the instantaneous voltage load that may act on the tapped coil.

Figure 3 illustrates a kind of circuit that changes, wherein a side two piezo-resistance V separately of having carried out of the method that is suitable for executive basis claim 1 An, V ApOr V Bn, V BpBe combined into common piezo-resistance V separately aOr V bWherein, each side mechanical switch DS separately aOr DS bAnd respective side piezo-resistance V separately aOr V bBe formed into equally the series circuit of common load lead-in wire.

Shown in Figure 4 according to another amended method of the present invention, it comes from the simplification of flow process, and wherein mechanical switch is not set.Also realize in the method creationary general viewpoint, namely use piezo-resistance to be used for the transformed load electric current.

This other method relates to, and for shunting switch, two load branch is set, and wherein each comprises by two opposite IGBT (I that connect in these two load branch An, I ApI Bn, I Bp) series circuit that consists of, with this series circuit a diode d is set in parallel respectively An, d Apd Bn, d BpWith described IGBT (I An, I ApI Bn, I Bp) in each arranges respectively a piezo-resistance V in parallel An, V ApV Bn, V Bp

When the conversion beginning, cut off the IGBT (I of side AnAnd I Ap) the conduction load current.

Then, the cut-out order behind these IGBT, the IGBT (I of connection side BnAnd I Bp) obtain to connect and order; The IGBT " firmly " that cuts off side cuts off.

Then, according to the present invention, load current is transformed into the piezo-resistance V that cuts off side AnAnd V ApOn.

Again then, load current is transformed into the IGBT (I of receiver side Bn, I Bp) upper and by its conduction.

Such as already explained, this method for simplifying relates to a kind of shunting switch, and its releasing contact that does not have machinery does not have the long-term work main contact of machinery yet, but wherein load current is in servicely conducted by IGBT fixing.

These two kinds of methods (method shown in the method shown in the accompanying drawing 1 and the accompanying drawing 4) are abideed by identical inventive concept set forth, and have realized in an identical manner purpose of the present invention.

Should again sum up at last the method according to this invention with respect to the top advantage that has described in detail of prior art.

-in the situation that the selection possibility that does not have the IGBT thermal overload when any each instantaneous value of load current, to change

A → the B of the load current of the shunting switch side of-about 10 μ s or the very fast transfer process of B → A

-avoid producing the vibration of interference

-do not need each shunting switch specific to the concrete specified DBMS (step voltage of the adaptive order situation in task ground, specified perforation electric current (Nenn-Durchgangsstrom), leakage inductance), as long as the limiting value of step voltage and the words that specified perforation electric current is not exceeded.

-have very large margin of tolerance, the healthy and strong inherently safe conversion designs for the skew change-over time between two IGBT wiring group.After doing the time than the farm labourer, do not need to calibrate again.

Claims (2)

1. one kind is used for without interruptedly having two load branch, i.e. load branch and a method of changing at tap n place between the winding tap of the adjustable variable-pressure device of the load branch at tap n+1 place, wherein
Each can both be via the mechanical switch (DS as releasing contact in these two load branch a, DS b) with the IGBT(I by two opposite connections that arranges with the series connection of this mechanical switch An, I ApI Bn, I Bp) series circuit that consists of is connected with common load leads, and
With each IGBT(I An, I ApI Bn, I Bp) be arranged in parallel a diode (d An, d Ap, d Bn, d Bp),
With each IGBT(I An, I ApI Bn, I Bp) be arranged in parallel a piezo-resistance (V An, V ApV Bn, V Bp),
Each can both be by the long-term work main contact (MC of machinery in these two load branch a, MC b) cross-over connection,
It is characterized in that, described method comprises the following methods step:
Releasing contact (the DS of closed amputation side and connection side a, DS b),
Starting resistor is applied to the IGBT(I that cuts off side An, I Ap) grid on, therefore and connect the IGBT(I that cuts off side An, I Ap),
Disconnect the long-term work main contacts (MC that cuts off side a),
With load current I LBe transformed on the IGBT that cuts off side,
Cut off the IGBT(I of side An, I Ap), the IGBT(I of connection side Bn, I Bp), so that cut off the IGBT(I of side An, I Ap) " firmly " cut-out,
Then load current is switched to the piezo-resistance (V that cuts off side AnAnd V Ap) on,
Then load current is switched to the IGBT(I that connects side Bn, I Bp) on,
The closed long-term work main contacts (MC that connects side b),
Cut off the IGBT(Ib that connects side nAnd Ib p),
Disconnect the releasing contact (DS that cuts off side and connect side aAnd DS b).
2. method according to claim 1 is characterized in that, also carry out current over-zero and detect, and transfer process is carried out near the current over-zero of load current in time.
CN 200880130034 2008-08-27 2008-08-27 Method for switching without any interruption between winding taps on a tap-changing transformer CN102077306B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/007003 WO2010022751A1 (en) 2008-08-27 2008-08-27 Method for switching without any interruption between winding taps on a tap-changing transformer

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CN102077306B true CN102077306B (en) 2013-03-27

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US (1) US8289068B2 (en)
EP (1) EP2319058B1 (en)
JP (1) JP5599796B2 (en)
KR (1) KR101416787B1 (en)
CN (1) CN102077306B (en)
AU (1) AU2008361188B2 (en)
BR (1) BRPI0822730A2 (en)
CA (1) CA2735031A1 (en)
HK (1) HK1151130A1 (en)
UA (1) UA97210C2 (en)
WO (1) WO2010022751A1 (en)

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EP2319058B1 (en) 2014-07-16
CN102077306A (en) 2011-05-25
KR20110056260A (en) 2011-05-26
WO2010022751A1 (en) 2010-03-04
HK1151130A1 (en) 2014-11-14
AU2008361188A1 (en) 2010-03-04
US8289068B2 (en) 2012-10-16
US20110102056A1 (en) 2011-05-05
AU2008361188B2 (en) 2014-11-20
CA2735031A1 (en) 2010-03-04
EP2319058A1 (en) 2011-05-11
JP2012501070A (en) 2012-01-12
BRPI0822730A2 (en) 2015-07-14
JP5599796B2 (en) 2014-10-01
UA97210C2 (en) 2012-01-10
KR101416787B1 (en) 2014-07-08

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